# A patient on day 7 of heparin therapy has a platelet count drop from 220,000 to 80,000 over 48 hours and develops a new DVT. The team suspects heparin-induced thrombocytopenia (HIT). Which actions are appropriate? Select all that apply.

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> language: en  
> subject: Reduction of Risk Potential  
> category: ROR

## Question

A patient on day 7 of heparin therapy has a platelet count drop from 220,000 to 80,000 over 48 hours and develops a new DVT. The team suspects heparin-induced thrombocytopenia (HIT). Which actions are appropriate? Select all that apply.

1

Educate the patient about lifelong heparin avoidance and document HIT as a documented allergy in the medical record.

2

Anticipate alternative anticoagulation with a non-heparin agent — argatroban or fondaparinux (or direct oral anticoagulant in stable cases) — to treat both HIT and the new thrombus.

3

STOP ALL heparin products immediately, including heparin flushes for IVs and heparin-coated catheters; continued exposure worsens thrombosis.

4

Send a HIT antibody assay (anti-PF4 ELISA) plus serotonin release assay (SRA) for confirmation while empirically treating based on the 4T score and clinical suspicion.

5

Administer a prophylactic platelet transfusion to reduce the risk of spontaneous bleeding given the severe thrombocytopenia and new clot formation.

## Explanation

HIT management: STOP all heparin (including flushes and coated lines), start non-heparin anticoagulation (argatroban or fondaparinux are first-line; warfarin contraindicated until platelets > 150k due to skin necrosis risk), confirm with antibody and functional assays, and lifelong avoidance with documented allergy. Choice 5 is wrong — platelet transfusion in HIT can WORSEN thrombosis; reserve only for active bleeding or pre-procedural needs.

## In-depth explanation

HIT NCLEX traps: (1) "give vitamin K or stop and restart later" — wrong, HIT requires PERMANENT heparin avoidance and immediate alternative anticoagulant; (2) "transfuse platelets to prevent bleeding" — wrong, can worsen thrombosis; (3) "use LMWH instead" — wrong, LMWH (enoxaparin) cross-reacts and is contraindicated. The 4T score (Thrombocytopenia, Timing, Thrombosis, oTher cause) guides empiric treatment.

## Clinical scenario

**Patient on day 7 of heparin** with **platelets 220k→80k over 48 hours** and **new DVT**. 4T score consistent with intermediate-to-high probability HIT. Hematology consulted.

## Key concepts

- **Heparin-induced thrombocytopenia (HIT)** — Immune-mediated reaction to heparin causing thrombocytopenia and PARADOXICAL thrombosis; typically days 5-14 of exposure.
- **4T score** — Thrombocytopenia, Timing of platelet fall, Thrombosis, oTher causes; 0-8 score guides empiric treatment.
- **Argatroban** — Direct thrombin inhibitor; first-line non-heparin anticoagulant for HIT; hepatic clearance, monitor aPTT.

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