Durgical
EN
Open the app

Patients on anticoagulants: bleeding watch, monitoring tests, interactions and teaching

  • Safe practice

Anticoagulants and antiplatelets prevent clots but cause bleeding: the nurse checks the right product, the tests, the bleeding signs and the interactions.

Updated

What it is

Anticoagulants and antiplatelets are high-alert medicines: an error or a missed sign can cause serious bleeding or a clot. Before each dose the nurse checks the product and the order, the ordered coagulation tests, the platelet count and any bleeding, and whether a procedure is coming. Unfractionated heparin in infusion is adjusted with the aPTT; warfarin with the PT/INR; low-molecular-weight heparin and the direct oral anticoagulants usually need no routine coagulation test but depend on kidney or liver function. Each drug has a reversal agent the team can use. Teaching covers bleeding signs, injury prevention, a steady diet for warfarin, and checking every new medicine or supplement.

What it requires

  • Double-checking high-alert medicines as the institution requires.
  • Bleeding watch: skin, gums, nose, urine, stools, vomit, puncture sites, and vital signs that suggest internal bleeding.
  • Monitoring tests ordered for each drug, and platelet and kidney results.
  • Interactions with medicines, herbs, alcohol and foods.
  • Planning around procedures, surgery and dental work, always under the prescriber's direction.

How it is applied (and why)

  1. Verify the product, concentration and order with the second check the institution requires — anticoagulants are high-alert medicines.
  2. Look for bleeding: skin, gums, nose, urine, stools, vomit and puncture sites — bleeding is the main adverse effect.
  3. Check pulse and blood pressure and ask about headache, dizziness or weakness — changes can mean internal bleeding.
  4. Review the ordered test before giving: aPTT for heparin infusion, PT/INR for warfarin, platelets and kidney function — they guide the dose.
  5. Give subcutaneous heparins with the technique on the subcutaneous injection page — the correct technique protects the site.
  6. Avoid intramuscular injections and unnecessary punctures — each one can bleed.
  7. Check every new medicine for interactions and ask about herbs and supplements — many change the effect.
  8. Ask whether a procedure, surgery or dental work is planned and tell the prescriber — the plan to pause or continue is medical.
  9. Teach bleeding signs, soft toothbrush, electric razor, fall prevention and the ID card; check teach-back — the patient watches at home.

In nursing practice

  • Call at once for bleeding that does not stop, vomit with blood, black or bloody stools, red or dark urine, or large dark bruises.
  • Call at once for a sudden severe headache, confusion, weakness, or a fall with a head knock.
  • Call for falling pressure with a rising pulse, or for a test result outside the range the doctor set.
  • Call for a marked fall in platelets, or a new clot, while on heparin.
  • After neuraxial anaesthesia or a spinal puncture, call for new leg weakness or numbness.

Common mistakes

  • Confusing heparin products or concentrations.
  • Giving warfarin without looking at the latest INR, or heparin infusion without the latest aPTT.
  • Giving an NSAID to a patient on an anticoagulant without checking with the prescriber.
  • Forgetting to ask whether a procedure or surgery is planned.
  • Teaching only about the medicine and not about the bleeding signs, falls and other medicines.

Test yourself

Think of the answer, then tap the question to see it.

Which test guides an unfractionated heparin infusion and which guides warfarin?

The aPTT guides the heparin infusion; the PT/INR guides warfarin.

What can a marked fall in platelets on heparin mean?

Heparin-induced thrombocytopenia; heparin is stopped as the protocol says and the doctor is informed at once.

What dietary advice is given to a patient on warfarin?

Keep the amount of vitamin K-rich foods, such as green leafy vegetables, steady from day to day, avoid alcohol and ask before major diet changes.

Which symptoms in a patient on an anticoagulant need an urgent call?

Bleeding that does not stop, black or bloody stools, blood in vomit or urine, a sudden severe headache, confusion or a blow to the head.

Add to my cards (4)

Elsewhere in DurgiPedia

Connections

← All of nursing

Educational content for students; it does not replace your institution's protocols, supervised clinical training or a prescriber's order. Dose-calculation examples use made-up numbers: they are educational, not a clinical order.

Sources: Nursing Pharmacology, 6.12 Blood Coagulation Modifiers (Open RN (Chippewa Valley Technical College), LibreTexts, 2020); Taking warfarin (Coumadin): MedlinePlus Medical Encyclopedia (MedlinePlus, US National Library of Medicine, 2026); Nursing Pharmacology, 6.4 Nursing Process Related to Cardiovascular and Renal Medications (Open RN (Chippewa Valley Technical College), LibreTexts, 2020).

Spotted a mistake?We are always improving for the community. Tell us what is wrong and our team will review it.Report a mistake

Representative model, for educational purposes only.