# A 65-year-old client started on warfarin 5 mg orally daily and concurrent therapeutic enoxaparin 3 days ago for a new pulmonary embolism. Today the INR is 1.2. The client has no active bleeding and is hemodynamically stable. Which interpretation by the nurse is correct? > source: MyMerci (mymerci.kr) > url: https://mymerci.kr/pages/nclex_q.php?qn_id=375008&lang=en > language: en > subject: Adverse Effects/Contraindications/Interactions > category: PA ## Question A 65-year-old client started on warfarin 5 mg orally daily and concurrent therapeutic enoxaparin 3 days ago for a new pulmonary embolism. Today the INR is 1.2. The client has no active bleeding and is hemodynamically stable. Which interpretation by the nurse is correct? ## Option 1. An INR of 1.2 on day 3 is subtherapeutic and suggests the warfarin dose is too low; the nurse should recommend administering a supplementary dose now and doubling the daily dose to reduce the risk of thrombus enlargement, while continuing enoxaparin until the INR is therapeutic. 2. INR of 1.2 on day 3 suggests warfarin is not effective; the nurse should prepare to discontinue warfarin and initiate apixaban without delay, as direct oral anticoagulants provide more predictable anticoagulation and do not require routine INR monitoring. 3. INR of 1.2 indicates the onset of warfarin effect, so the nurse should discontinue enoxaparin today because the client is now partially anticoagulated and continuing both agents elevates the risk of hemorrhage without providing additional thromboprophylactic advantage. 4. INR of 1.2 on day 3 is consistent with the typical warfarin warm-up — therapeutic INR is usually reached around days 5-7; continue enoxaparin per protocol, do NOT discontinue, and recheck INR per provider schedule. Warfarin dose adjustment is by the prescriber based on INR trend and target. **✔ Correct answer** **Correct answer: 4** ## Explanation Day 3 INR 1.2 — expected warm-up Warfarin onset takes 5-7 days. INR begins to drift up after factor II (longest half-life ~60 hours) declines. Day 3 INR of 1.2 is expected and not a treatment failure. The patient is protected by the parenteral agent during this warm-up. Key teaching/practice points: • Continue parenteral anticoagulant until both criteria are met: ≥5 days of warfarin AND INR ≥2.0 for ≥24 hours. • Do NOT double the warfarin dose based on a day-3 INR; dose adjustments use anticipated trend, dose-response algorithms, and clinical context. • Some patients reach therapeutic INR earlier or later — typical warfarin sensitivity, age, weight, drug/diet interactions, genetics (CYP2C9, VKORC1) affect kinetics. • If the patient develops new bleeding or thrombosis during warm-up, re-evaluate. • Switching to a DOAC (apixaban, rivaroxaban) can be considered as a clinical decision but is not the response to a normal warm-up INR. • Standard NCLEX testing point: INR 1.2 on day 3 = continue current plan, NOT a failure. ## In-depth explanation Clinical reasoning summary Day 3 INR 1.2 — expected warm-up Warfarin onset takes 5-7 days. INR begins to drift up after factor II (longest half-life ~60 hours) declines. Day 3 INR of 1.2 is expected and not a treatment failure. The patient is protected by the parenteral agent during this warm-up. Key teaching/practice points: • Continue parenteral anticoagulant until both criteria are met: ≥5 days of warfarin AND INR ≥2.0 for ≥24 hours. • Do NOT double the warfarin dose based on a day-3 INR; dose adjustments use anticipated trend, dose-response algorithms, and clinical context. • Some patients reach therapeutic INR earlier or later — typical warfarin sensitivity, age, weight, drug/diet interactions, genetics (CYP2C9, VKORC1) affect kinetics. • If the patient develops new bleeding or thrombosis during warm-up, re-evaluate. • Switching to a DOAC (apixaban, rivaroxaban) can be considered as a clinical decision but is not the response to a normal warm-up INR. • Standard NCLEX testing point: INR 1.2 on day 3 = continue current plan, NOT a failure. ## Related questions - [A nurse is reviewing the morning lab results for an adult client receiving warfarin for at…](https://mymerci.kr/pages/nclex_q.php?qn_id=360515&lang=en) - [A client is admitted to the emergency department after ingesting an unknown amount of acet…](https://mymerci.kr/pages/nclex_q.php?qn_id=362720&lang=en) - [A client with chronic heart failure is prescribed metoprolol 25 mg orally twice daily. Bef…](https://mymerci.kr/pages/nclex_q.php?qn_id=362756&lang=en) - [A 28-year-old client with type 1 diabetes receives regular insulin 6 units and NPH insulin…](https://mymerci.kr/pages/nclex_q.php?qn_id=362792&lang=en) - [A client receives IV vancomycin 1 g every 12 hours for MRSA bacteremia. Before the next do…](https://mymerci.kr/pages/nclex_q.php?qn_id=362833&lang=en) - [A client with bipolar disorder has been taking lithium carbonate 600 mg orally three times…](https://mymerci.kr/pages/nclex_q.php?qn_id=362894&lang=en) - [An 80-year-old male with heart failure is prescribed digoxin 0.125 mg daily. During mornin…](https://mymerci.kr/pages/nclex_q.php?qn_id=372686&lang=en) - [A 38-year-old female with rheumatoid arthritis is being discharged with a new prescription…](https://mymerci.kr/pages/nclex_q.php?qn_id=372687&lang=en) ## Read in another language - [en](https://mymerci.kr/pages/nclex_q.php?qn_id=375008&lang=en) - [ko](https://mymerci.kr/pages/nclex_q.php?qn_id=375008&lang=ko) - [ja](https://mymerci.kr/pages/nclex_q.php?qn_id=375008&lang=ja) - [zh-TW](https://mymerci.kr/pages/nclex_q.php?qn_id=375008&lang=zh-tw) - [vi](https://mymerci.kr/pages/nclex_q.php?qn_id=375008&lang=vi) --- More free questions: [NCLEX-RN Practice](https://mymerci.kr/pages/nclex_bank.php?lang=en) _For study reference only. Always follow current clinical guidelines and your institution’s protocols._