The nurse is caring for a patient who is active duty military. The nurse suspects the patient may be suicidal. According to current research on laboratory values and suicide, which action by the nurse would be most appropriate?
1. Review the patient's vitamin K level
2. Review the patient's vitamin D level
3. Review the patient's serum calcium level
4. Review the patient's serum potassium level
Answer: 2
Explanation: While further research is still needed, research has found a relationship between completed suicide and low vitamin D levels. While reviewing the other laboratory values are not inappropriate, these actions do not reflect the current research on laboratory values and suicide.
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