NCLEX Question of the Day – Tuesday, March 10, 2026

Today’s question targets safe medication management with anticoagulants. This matters because a delayed response to a serious drug reaction can turn a stable patient into an emergency. The nurse must recognize red flags fast, stop the harm, and set up the next safe step.

Clinical Scenario

A 56-year-old patient is on postoperative day 3 after a right total hip arthroplasty. She is receiving an unfractionated heparin infusion for VTE prophylaxis. Yesterday her platelet count was 220,000/mm3; this morning it is 90,000/mm3. She reports new aching in her left calf. Vital signs: BP 126/78, HR 88, RR 16, SpO2 98% on room air, temperature 37.1 C. No bleeding is noted. aPTT is within the target range. The IV is a central line that also has heparinized flush orders.

The Question

Which action should the nurse take first?

Answer Choices

1. Stop the heparin infusion and notify the provider of possible heparin-induced thrombocytopenia.
2. Continue the heparin at the current rate and recheck the platelet count in 6 hours.
3. Administer protamine sulfate to reverse heparin and then flush the line per protocol.
4. Apply sequential compression devices to both legs and encourage early ambulation.

Correct Answer

A. Stop the heparin infusion and notify the provider of possible heparin-induced thrombocytopenia.

Detailed Rationale

This patient has a >50% drop in platelets within a few days of starting heparin and new limb pain suggestive of thrombosis. That pattern fits suspected heparin-induced thrombocytopenia (HIT). HIT is an immune reaction that activates platelets and causes clotting, not bleeding. The danger is rapid progression to DVT, PE, limb ischemia, or stroke. The first priority is to remove the trigger: stop all heparin exposure immediately.

What the nurse should do next and why:

• Stop the heparin infusion now. This removes the antigen that is driving platelet activation and lowers the risk of new clots.
• Assess for complications: check bilateral calf circumference, pulses, skin temperature, and color; monitor for chest pain, dyspnea, or neurological changes. These findings guide urgency.
• Notify the provider promptly and report the platelet drop percentage, timing since heparin start, and new calf pain. This frames a high 4T score (thrombocytopenia, timing, thrombosis, other causes).
• Anticipate orders: send HIT antibody testing, avoid all heparin products (including line flushes and heparin-coated catheters), and start a non-heparin anticoagulant such as argatroban, bivalirudin, or fondaparinux. This maintains anticoagulation because these patients clot easily.
• Label the chart and wristband for “heparin-induced thrombocytopenia—avoid heparin/LMWH.” This prevents accidental re-exposure.
• Monitor platelets, aPTT or drug-specific labs for the alternative anticoagulant, and signs of thrombosis or bleeding. This tracks recovery and safety.

Why this is the first step: If the drug causing harm remains infusing, risk rises by the minute. Stopping heparin addresses the root cause before anything else.

Why the Other Options Are Wrong

• B. Continue the heparin and recheck later: Unsafe. A >50% platelet fall plus new limb pain is a HIT red flag. Delaying action increases the risk of clot extension or embolism.
• C. Give protamine and flush the line: Protamine reverses heparin’s anticoagulant effect during bleeding or pre-procedure. HIT is a prothrombotic state, not a bleeding emergency. Protamine does not treat the immune mechanism and may worsen thrombosis risk if anticoagulation is suddenly removed without a non-heparin bridge. Also, heparin flushes are contraindicated in suspected HIT.
• D. Apply SCDs and ambulate: Mechanical compression is contraindicated if acute DVT is suspected because it can dislodge a clot. With new calf pain and platelet drop on heparin, suspect HIT-associated thrombosis first. Ambulation can also mobilize a clot.

Key Takeaways

• Think HIT with a platelet drop ≥50% occurring 5–10 days after heparin start (or sooner with prior exposure) and any sign of thrombosis.
• First action: stop all heparin sources, including flushes and heparin-coated lines. Then notify the provider.
• HIT patients clot, not bleed—expect to start a non-heparin anticoagulant promptly.
• Do not use protamine for routine HIT management unless there is active bleeding and a plan for immediate alternative anticoagulation.
• Avoid SCDs and vigorous ambulation when DVT is suspected.

On-shift checklist:

• Compare today’s platelets with baseline; calculate percent change.
• Screen for new pain, swelling, color change, dyspnea, chest pain, neuro deficits.
• If HIT suspected: stop heparin, hold heparin flushes, notify provider, prepare non-heparin anticoagulant.
• Label “HIT—no heparin/LMWH,” send HIT labs, and monitor closely.

Quick Practice Extension

• A patient on low–molecular weight heparin for 7 days develops a 60% platelet drop but no bleeding. What orders do you anticipate, and what medications must you avoid?
• A patient with confirmed HIT now has a new right arm weakness. What immediate assessments and interventions are your priority?

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