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Physiological AdaptationPlatelets < 150,000

ThrombocytopeniaNCLEX cheat sheet

Thrombocytopenia is an abnormally low platelet count, impairing the blood's ability to clot and raising bleeding risk.

22 key facts 3 practice questions Reviewed Oct 2026
The 1-minute sheetCinnaRN

Values

  • normal 150k-400k
  • <50k: bleeding risk ↑
  • <20k: spontaneous bleed

Signs

  • petechiae, purpura, ecchymosis
  • gum/nose bleed, hematuria

Report

  • HA, ↓LOC → intracranial bleed
  • occult/frank blood in stool/urine

Do

  • bleeding precautions, soft toothbrush
  • electric razor, no IM/rectal
  • no aspirin/NSAIDs, fall precautions
Red flag to remember

Report headache, confusion, vision changes, or altered consciousness suggesting intracranial bleeding.

Before you read

Test yourself first: 3 questions

Question 1 of 3

A client on a heparin drip should be monitored for heparin-induced thrombocytopenia. Which laboratory trend would most strongly suggest this complication?

What is thrombocytopenia?

Causes include decreased production (marrow suppression, chemotherapy, leukemia), increased destruction (immune thrombocytopenia, heparin-induced), and sequestration in an enlarged spleen. It matters because spontaneous and prolonged bleeding can occur, with intracranial hemorrhage as the most feared outcome.

Key points to remember

  • Platelet counts below 150,000/mm3 define thrombocytopenia; spontaneous bleeding risk rises sharply below 20,000.
  • Petechiae, purpura, ecchymoses, and easy bruising are early skin signs.
  • Mucosal bleeding shows as gum bleeding, epistaxis, hematuria, and prolonged bleeding from cuts.
  • Heparin-induced thrombocytopenia (HIT) paradoxically causes clotting plus falling platelets.
  • Immune thrombocytopenic purpura (ITP) results from antibody-mediated platelet destruction.
  • Internal bleeding may present as melena, hematemesis, or neurologic changes.

Signs & symptoms

  • petechiae, purpura, ecchymosis
  • gum/nose bleed, hematuria

Nursing priorities

  1. Institute bleeding precautions: soft toothbrush, electric razor, no IM injections, no rectal temps/suppositories.
  2. Avoid aspirin, NSAIDs, and other antiplatelet agents.
  3. Apply firm, prolonged pressure to any puncture or bleeding site.
  4. Monitor for occult and overt bleeding, including stool, urine, and neurologic checks.
  5. Administer platelet transfusions or other therapies (steroids, IVIG) as prescribed.

Labs & values

Platelets (normal150,000-400,000/mm3) decreased
Platelets under20,000/mm3 indicate high spontaneous bleeding risk
Hemoglobin/hematocrit may fall with significant bleeding

Patient teaching

  • Use a soft toothbrush and electric razor; avoid flossing aggressively, contact sports, and activities with fall risk.
  • Do not take aspirin, ibuprofen, or other NSAIDs unless approved by the provider.
  • Report bleeding that won't stop, black or bloody stools, blood in urine, or a severe headache right away.

Red flags: report now

  • Report headache, confusion, vision changes, or altered consciousness suggesting intracranial bleeding.
  • Report any active or uncontrolled bleeding, or a platelet count below the critical threshold.
  • In suspected HIT, stop all heparin immediately and report it; never give platelets routinely in HIT.

References

Clinical references for this topic

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