Heparin-Induced Thrombocytopenia
- Immune-mediated reaction to heparin exposure.
- Antibodies bind the PF4–heparin complex and triggers platelet activation.
- Activated platelets aggregate and form clots/ thrombi.
- As clots form, more platelets are consumed, resulting in a reduced circulating platelet count.
- Without treatment, ~50% of patients develop thrombosis.
Presenter: Dikla Fuchs
(Gollomp et al., 2021; Konkle, 2026; Papadakis et al., 2025; Patriarcheas et al., 2020).
SMART
Objective
By session end, learners will be able to state the correct sequence for diagnosing and treating HIT by, (1), identifying HIT risk factors in patients exposed to heparin, (2), monitoring platelet levels with serial counts to determine pretest probability, (3), using the 4T score to assess likelihood of HIT, (4), selecting ELISA as the first laboratory test and (4), ordering a functional assay to confirm diagnosis, (5), recommending a switch to a non-heparin anticoagulant within 24 hours when HIT is suspected or confirmed.
Read more
HIT: Risk Factors
• Risk increases with longer heparin exposure and higher doses. • Unfractionated heparin (UFH) carries approximately ten-fold higher risk than low-molecular-weight heparin (LMWH). • Female patients are at higher risk than males. • Highest risk occurs in patients undergoing major surgery or trauma.
(Konkle, 2026)
Left Untreated
- Progressive platelet activation and thrombosis.
- Complications:
deep vein thrombosis (DVT)pulmonary embolismlimb ischemiastroke
- Mortality risk increases without timely withdrawal of heparin and initiation of non-heparin anticoagulation.
Without treatment, ~50% of patients develop thrombosis.
(Gollomp et al., 2021; Konkle, 2026; Papadakis et al., 2025; Patriarcheas et al., 2020).
PRESENTATION | SYMPTOMS
- Platelet decline ≥50% from baseline.
- Onset typically 5–10 days after heparin exposure.
- New thrombosis:
- Deep vein thrombosis (DVT) or pulmonary embolism (PE).
- Acute limb ischemia or catheter-related thrombosis.
- Possible skin necrosis at injection sites.
- Bleeding is uncommon.
Read more
(Gollomp et al., 2021; Konkle, 2026; Papadakis et al., 2025; Patriarcheas et al., 2020).
EVALUATION
• Platelet decline ≥50% from baseline. • Timing consistent with day 5–10 post-heparin exposure. • Presence of new thrombosis. • Apply 4T Score: 0–3: HIT unlikely → discontinue workup.4–8: HIT possible/likely → order diagnostic testing and initiate treatment.• UFH has ~10× higher risk of HIT than LMWH.
(Gollomp et al., 2021; Konkle, 2026; Papadakis et al., 2025; Patriarcheas et al., 2020).
Diagnosis
1. Estimate probability (4T score). If 4T score ≥4:a. Discontinue all heparin exposure, including line flushes. b. initiate non-heparin anticoagulation while awaiting confirmation. 2. Order PF4 ELISA – screening test with high sensitivity. If ELISA positive:3. Order confirmatory Serotonin Release Assay (SRA).if SRA positive: confirmation of hit
(Gollomp et al., 2021; Konkle, 2026; Papadakis et al., 2025; Patriarcheas et al., 2020).
TREATMENT
Initiate a non-heparin anticoagulant (argatroban, bivalirudin, or fondaparinux).Avoid platelet transfusion unless life-threatening bleeding occurs.Delay warfarin initiation until platelet count > 150,000/µL; overlap with direct thrombin inhibitor when starting.Document HIT clearly in medical record; avoid future heparin exposure.
Read more
Read more
(Gollomp et al., 2021; Konkle, 2026; Papadakis et al., 2025; Patriarcheas et al., 2020).
4T Score: HIT Probability Tool
Estimate likelihood of HIT before ordering labs or initiating treatment.
1) Thrombocytopenia 2 = Platelet fall ≥50% and nadir ≥20K 1 = Platelet fall 30–50% or nadir 10–19K 0 = Platelet fall <30% or nadir <10K 2) Timing 2 = Day 5–10 after heparin start, or ≤1 day with recent heparin exposure 1 = Timing unclear or >10 days 0 = Platelet fall ≤4 days with no recent heparin
3) Thrombosis 2 = New thrombosis, skin necrosis, acute systemic reaction to IV heparin 1 = Suspected or progressive thrombosis 0 = No thrombosis 4) oTher Causes 2 = No other cause identified 1 = Possible other cause 0 = Definite other cause
HIT Score Interpretationscore. Likelihood Action 0–3. Low Do not test. Do not treat. 4–5 Intermediate Test + start non-heparin anticoagulant 6–8. High Treat as HIT while confirming.**
Read more
(Gollomp et al., 2021; Konkle, 2026; Papadakis et al., 2025; Patriarcheas et al., 2020).
PF4 / Heparin Antibody ELISA
• Diagnostic laboratory test for patients with 4T ≥ 4. • Detects IgG antibodies against the PF4–heparin complex.
High sensitivity (~98–100%): Low specificity (~30–40%):
A negative ELISA rules out HIT.
A positive ELISA does NOT confirm HIT Follow with a functional assay.
Note: Some patients develop antibodies without platelet activation: producing false positives.
Optical Density (OD) Result Guide<0.6 HIT unlikely: r/o HIT1.0–2.0 Indeterminate: order functional test>2.0 Strong HIT likelihood: order functional test (SRA)
(Gollomp et al., 2021; Konkle, 2026; Papadakis et al., 2025; Patriarcheas et al., 2020).
functional assay: Serotonin Release Assay
Function:- Confirms HIT
- Measures platelet activation in presence of heparin antibodies
Mechanism: - Donor platelets are exposed to patient serum + heparin
- Serotonin release indicates antibody-mediated platelet activation.
When to Order - When OD 1.0–2.0 (equivocal).
- clinical or diagnostic uncertainty
High specificity Positive SRA = confirm HIT Negative SRA = Rule out HIT
(Gollomp et al., 2021; Konkle, 2026; Papadakis et al., 2025; Patriarcheas et al., 2020).
Summary: Stepwise Approach to HIT
- Stop all heparin.
- Estimate probability (4T score).
- Order PF4 ELISA if 4T ≥4.
- Confirm with SRA.
- Start non-heparin anticoagulant.
(Gollomp et al., 2021; Konkle, 2026; Papadakis et al., 2025; Patriarcheas et al., 2020).
Referance
- Gollomp, K., Rauova, L., & Poncz, M. (2021). Heparin-induced thrombocytopenia. In Kaushansky, K., Prchal, J. T., Burns, L. J., Lichtman, M. A., Levi, M., & Linch, D. C. (Eds.), Williams Hematology (10th ed.). McGraw-Hill Education.
- Konkle, B. A. (2026). Disorders of platelets and vessel wall. In Longo, D., Fauci, A., Kasper, D., Hauser, S., Jameson, J., Loscalzo, J., Holland, S., & Langford, C. (Eds.), Harrison’s Principles of Internal Medicine (22nd ed.). McGraw Hill.
- Papadakis, M. A., Rabow, M. W., & McQuaid, K. R. (Eds.). (2025). Thrombocytopenia, heparin-induced (HIT). In Quick Medical Diagnosis & Treatment 2025. McGraw Hill.
- Patriarcheas, V., Pikoulas, A., Kostis, M., Charpidou, A., & Dimakakos, E. (2020). Heparin-induced thrombocytopenia: Pathophysiology, diagnosis and management. Cureus, 12(3), e7385. https://doi.org/10.7759/cureus.7385
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We sabotage boredom. We create what the brain likes to consume because it stimulates it. What you read: interactivity and animation can make the most boring content become something fun. At Genially, we use AI (Awesome Interactivity) in all our designs, so you level up with interactivity and turn your content into something that adds value and engages. When delivering a presentation, the goal is to transmit information and prevent yawns. It can be a good practice to make an outline and use words that are etched into your audience's memory. If you want to provide additional information or develop the content in more detail, you can do so through your oral presentation. We recommend practicing your voice and rehearsing.
- Last Name Last Name, Author (20XX), Book Title.Place of publication: Publisher.
- Last Name Last Name, Author (20XX), Book Title.Place of publication: Publisher.
- Last Name Last Name, Author (20XX), Book Title.Place of publication: Publisher.
- Last Name Last Name, Author (20XX), Book Title.Place of publication: Publisher.
- Last Name Last Name, Author (20XX), Book Title.Place of publication: Publisher.
- Last Name Last Name, Author (20XX), Book Title.Place of publication: Publisher.
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We sabotage boredom. We create what the brain likes to consume because it stimulates it. What you read: interactivity and animation can make the most boring content become something fun. At Genially, we use AI (Awesome Interactivity) in all our designs, so you level up with interactivity and turn your content into something that adds value and engages. When delivering a presentation, the goal is to transmit information and prevent yawns. It can be a good practice to make an outline and use words that are etched into your audience's memory. If you want to provide additional information or develop the content in more detail, you can do so through your oral presentation. We recommend practicing your voice and rehearsing.
- Last Name Last Name, Author (20XX), Book Title.Place of publication: Publisher.
- Last Name Last Name, Author (20XX), Book Title.Place of publication: Publisher.
- Last Name Last Name, Author (20XX), Book Title.Place of publication: Publisher.
- Last Name Last Name, Author (20XX), Book Title.Place of publication: Publisher.
- Last Name Last Name, Author (20XX), Book Title.Place of publication: Publisher.
- Last Name Last Name, Author (20XX), Book Title.Place of publication: Publisher.
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We sabotage boredom. We create what the brain likes to consume because it stimulates it. What you read: interactivity and animation can turn the most boring content into something fun. At Genially, we use AI (Awesome Interactivity) in all our designs to elevate your content with interactivity and make it engaging and valuable. When giving a presentation, two goals should be pursued: transmit information and avoid yawns. A good practice is to make an outline and use words that are etched into your audience's memory. If you want to add more information or develop the content in greater detail, you can do so through your oral presentation. We recommend practicing your voice and rehearsing.
'Demonstrating enthusiasm, smiling, and maintaining eye contact with your audience can be your best allies when telling stories that move and pique the audience's interest: 'The eyes, chico. They never lie'. This will help you connect with your audience. Leave them with their mouths open! Did you know that Genially allows you to share your creation directly, without downloads? So your audience can view it on any device and share it anywhere. Pose a dramatic question; it’s the essential ingredient to keep the audience’s attention. It’s usually posed subtly at the beginning of the story to intrigue the audience and is resolved at the end.
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Heparin-Induced Thrombocytopenia
Di Fuchs
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Transcript
Heparin-Induced Thrombocytopenia
Presenter: Dikla Fuchs
(Gollomp et al., 2021; Konkle, 2026; Papadakis et al., 2025; Patriarcheas et al., 2020).
SMART
Objective
By session end, learners will be able to state the correct sequence for diagnosing and treating HIT by, (1), identifying HIT risk factors in patients exposed to heparin, (2), monitoring platelet levels with serial counts to determine pretest probability, (3), using the 4T score to assess likelihood of HIT, (4), selecting ELISA as the first laboratory test and (4), ordering a functional assay to confirm diagnosis, (5), recommending a switch to a non-heparin anticoagulant within 24 hours when HIT is suspected or confirmed.
Read more
HIT: Risk Factors
• Risk increases with longer heparin exposure and higher doses. • Unfractionated heparin (UFH) carries approximately ten-fold higher risk than low-molecular-weight heparin (LMWH). • Female patients are at higher risk than males. • Highest risk occurs in patients undergoing major surgery or trauma.
(Konkle, 2026)
Left Untreated
- Progressive platelet activation and thrombosis.
- Complications:
deep vein thrombosis (DVT)pulmonary embolismlimb ischemiastrokeWithout treatment, ~50% of patients develop thrombosis.
(Gollomp et al., 2021; Konkle, 2026; Papadakis et al., 2025; Patriarcheas et al., 2020).
PRESENTATION | SYMPTOMS
Read more
(Gollomp et al., 2021; Konkle, 2026; Papadakis et al., 2025; Patriarcheas et al., 2020).
EVALUATION
• Platelet decline ≥50% from baseline. • Timing consistent with day 5–10 post-heparin exposure. • Presence of new thrombosis. • Apply 4T Score: 0–3: HIT unlikely → discontinue workup.4–8: HIT possible/likely → order diagnostic testing and initiate treatment.• UFH has ~10× higher risk of HIT than LMWH.
(Gollomp et al., 2021; Konkle, 2026; Papadakis et al., 2025; Patriarcheas et al., 2020).
Diagnosis
1. Estimate probability (4T score). If 4T score ≥4:a. Discontinue all heparin exposure, including line flushes. b. initiate non-heparin anticoagulation while awaiting confirmation. 2. Order PF4 ELISA – screening test with high sensitivity. If ELISA positive:3. Order confirmatory Serotonin Release Assay (SRA).if SRA positive: confirmation of hit
(Gollomp et al., 2021; Konkle, 2026; Papadakis et al., 2025; Patriarcheas et al., 2020).
TREATMENT
Initiate a non-heparin anticoagulant (argatroban, bivalirudin, or fondaparinux).Avoid platelet transfusion unless life-threatening bleeding occurs.Delay warfarin initiation until platelet count > 150,000/µL; overlap with direct thrombin inhibitor when starting.Document HIT clearly in medical record; avoid future heparin exposure.
Read more
Read more
(Gollomp et al., 2021; Konkle, 2026; Papadakis et al., 2025; Patriarcheas et al., 2020).
4T Score: HIT Probability Tool
Estimate likelihood of HIT before ordering labs or initiating treatment.
1) Thrombocytopenia 2 = Platelet fall ≥50% and nadir ≥20K 1 = Platelet fall 30–50% or nadir 10–19K 0 = Platelet fall <30% or nadir <10K 2) Timing 2 = Day 5–10 after heparin start, or ≤1 day with recent heparin exposure 1 = Timing unclear or >10 days 0 = Platelet fall ≤4 days with no recent heparin
3) Thrombosis 2 = New thrombosis, skin necrosis, acute systemic reaction to IV heparin 1 = Suspected or progressive thrombosis 0 = No thrombosis 4) oTher Causes 2 = No other cause identified 1 = Possible other cause 0 = Definite other cause
HIT Score Interpretationscore. Likelihood Action 0–3. Low Do not test. Do not treat. 4–5 Intermediate Test + start non-heparin anticoagulant 6–8. High Treat as HIT while confirming.**
Read more
(Gollomp et al., 2021; Konkle, 2026; Papadakis et al., 2025; Patriarcheas et al., 2020).
PF4 / Heparin Antibody ELISA
• Diagnostic laboratory test for patients with 4T ≥ 4. • Detects IgG antibodies against the PF4–heparin complex.
High sensitivity (~98–100%): Low specificity (~30–40%):
A negative ELISA rules out HIT.
A positive ELISA does NOT confirm HIT Follow with a functional assay.
Note: Some patients develop antibodies without platelet activation: producing false positives.
Optical Density (OD) Result Guide<0.6 HIT unlikely: r/o HIT1.0–2.0 Indeterminate: order functional test>2.0 Strong HIT likelihood: order functional test (SRA)
(Gollomp et al., 2021; Konkle, 2026; Papadakis et al., 2025; Patriarcheas et al., 2020).
functional assay: Serotonin Release Assay
Function:- After a positive ELISA
- When OD 1.0–2.0 (equivocal).
- clinical or diagnostic uncertainty
- Confirms HIT
- Measures platelet activation in presence of heparin antibodies
Mechanism:- Donor platelets are exposed to patient serum + heparin
- Serotonin release indicates antibody-mediated platelet activation.
When to OrderHigh specificity Positive SRA = confirm HIT Negative SRA = Rule out HIT
(Gollomp et al., 2021; Konkle, 2026; Papadakis et al., 2025; Patriarcheas et al., 2020).
Summary: Stepwise Approach to HIT
(Gollomp et al., 2021; Konkle, 2026; Papadakis et al., 2025; Patriarcheas et al., 2020).
Referance
Back
Here you can add a highlighted title,something that captivates your audience
Boring presentation
WOW Presentation
You know a presentation/content is WOW when you maintain your class's attention, everyone absorbs the information you've shared, genuine learning experiences are created, and both motivation and participation skyrocket.
You know a presentation is boring when you see that drowsiness takes over your class, no one has understood anything you've explained, the classroom turns into a yawning factory, and there's so much text that not even an image fits.
Back
Chapters in collective works
We sabotage boredom. We create what the brain likes to consume because it stimulates it. What you read: interactivity and animation can turn the most boring content into something fun. At Genially, we use AI (Awesome Interactivity) in all our designs, so you level up with interactivity and turn your content into something valuable and engaging. When giving a presentation, two objectives should be pursued: transmit information and prevent yawns. To do this, it can be good practice to create an outline and use words that are etched into your audience's memory. If you want to provide additional information or develop the content in more detail, you can do so through your oral presentation. We recommend practicing your voice and rehearsing.
Link of interest
Link of interest
Link of interest
Link of interest
Link of interest
Back
Articles in indexed journals
We sabotage boredom. We create what the brain likes to consume because it stimulates it. What you read: interactivity and animation can make the most boring content become something fun. At Genially, we use AI (Awesome Interactivity) in all our designs, so you level up with interactivity and turn your content into something that adds value and engages. When delivering a presentation, the goal is to transmit information and prevent yawns. It can be a good practice to make an outline and use words that are etched into your audience's memory. If you want to provide additional information or develop the content in more detail, you can do so through your oral presentation. We recommend practicing your voice and rehearsing.
Link of interest
Link of interest
Link of interest
Link of interest
Link of interest
Back
Articles in indexed journals
We sabotage boredom. We create what the brain likes to consume because it stimulates it. What you read: interactivity and animation can make the most boring content become something fun. At Genially, we use AI (Awesome Interactivity) in all our designs, so you level up with interactivity and turn your content into something that adds value and engages. When delivering a presentation, the goal is to transmit information and prevent yawns. It can be a good practice to make an outline and use words that are etched into your audience's memory. If you want to provide additional information or develop the content in more detail, you can do so through your oral presentation. We recommend practicing your voice and rehearsing.
Link of interest
Link of interest
Link of interest
Link of interest
Link of interest
Back
Write a great subtitle here to give context
A great presentation…
We sabotage boredom. We create what the brain likes to consume because it stimulates it. What you read: interactivity and animation can turn the most boring content into something fun. At Genially, we use AI (Awesome Interactivity) in all our designs to elevate your content with interactivity and make it engaging and valuable. When giving a presentation, two goals should be pursued: transmit information and avoid yawns. A good practice is to make an outline and use words that are etched into your audience's memory. If you want to add more information or develop the content in greater detail, you can do so through your oral presentation. We recommend practicing your voice and rehearsing.
'Demonstrating enthusiasm, smiling, and maintaining eye contact with your audience can be your best allies when telling stories that move and pique the audience's interest: 'The eyes, chico. They never lie'. This will help you connect with your audience. Leave them with their mouths open! Did you know that Genially allows you to share your creation directly, without downloads? So your audience can view it on any device and share it anywhere. Pose a dramatic question; it’s the essential ingredient to keep the audience’s attention. It’s usually posed subtly at the beginning of the story to intrigue the audience and is resolved at the end.
Disciplines like Visual Thinking facilitate taking visually rich notes through the use of images, graphics, infographics, and simple drawings. Keep it up!
Back
Represent your data in the simplest way
Choose your graphic, organize the figures, and paste them into Genially
If your Genially includes data that is difficult to explain or understand, don't hesitate: including graphics will help better understand each data point and give it meaning.
Haven't convinced you yet to use graphics to promote learning?Well, you should know that the brain loves them, and if their content is animated, even more! It retains 42% more information with dynamic stimuli. Before you start creating, take time and think about which graphic you will choose to meet the learning objectives.