A 53-year-old client with suspected leukemia is scheduled for a bone marrow biopsy this afternoon. The client appears anxious and asks multiple questions about the procedure. Which nursing intervention is most important to implement before the procedure?

Obtaining informed consent is the most critical nursing intervention before any invasive procedure like bone marrow biopsy.

Bone marrow biopsy is an invasive test for diagnosing hematologic diseases, requiring proper preparation and patient understanding. The most important nursing intervention before the procedure is obtaining the consent form and confirming that the patient fully understands the procedure.

The consent form is a legal and ethical requirement that protects both the patient and the medical staff. The nurse must verify that the physician has explained the purpose, risks, benefits, and alternatives of the procedure. The patient should understand that a bone marrow biopsy involves inserting a needle through the skin and bone to collect a bone marrow sample, typically performed at the posterior iliac crest.

The key element of consent verification is ensuring the patient understands the purpose of the procedure (diagnosing hematologic diseases such as leukemia), potential complications (bleeding, infection, pain), and post-procedure care requirements. A patient who appears anxious and asks many questions indicates a need for thorough education and consent verification.

Pain management, positioning, and site preparation are also important aspects of procedure preparation, but these are performed after obtaining consent. The nurse cannot proceed with any procedure preparation until legal consent is secured and the patient demonstrates understanding of the procedure.

Understanding the Priority: Legal and Ethical Safeguard
Before any invasive procedure such as a bone marrow biopsy, the nurse’s most critical responsibility is ensuring patient safety through legal and ethical practice. While the client’s anxiety is an important clinical finding, the intervention that must occur first is verifying that informed consent has been obtained and that the client demonstrates comprehension of the procedure. This is not merely a form to be signed; it is a process that protects the client’s autonomy and the legal integrity of the healthcare team.

Why Other Interventions Are Secondary
Administering an analgesic (Option 1), positioning the client prone (Option 3), and preparing the site with antiseptic (Option 4) are all essential steps in the procedure. However, performing any of these actions before confirming valid informed consent constitutes a legal and ethical violation, specifically battery—the unlawful touching of a person without consent. The nurse must first validate that the consent form is signed and, more importantly, that the client can verbalize understanding of the purpose, risks, and benefits of the biopsy. If the client’s anxiety stems from a knowledge deficit, the nurse’s role is to clarify information and, if necessary, notify the provider for further explanation before proceeding.

Connecting Anxiety to the Consent Process
The client’s anxious state and repeated questions signal a potential gap in understanding. High anxiety can impair a client’s ability to process and retain information, which directly impacts the validity of their consent. While non-pharmacological distraction techniques are effective for managing procedural pain and anxiety, as demonstrated in pediatric populations during venipuncture ^[1], the immediate priority for an adult undergoing a diagnostic procedure for a suspected life-altering condition like leukemia is cognitive and legal assurance. The nurse’s therapeutic communication to explore the client’s fears and clarify misconceptions is a direct component of the informed consent process. This step ensures the client’s decision is truly informed, a foundational principle that must be upheld before any physical preparation or pre-medication begins.