The nurse has been able to draw the daily blood specimen from a client’s hickman catheter only after requesting that the client raise the arms and cough. the client asks the nurse why this is necessary. the nurse should tell the client:

Raising arms and coughing are used to increase blood flow and stimulate movement in the Hickman catheter, making it easier for the nurse to draw a blood sample.

The raising of arms and coughing by a client is generally advised in order to enhance the blood flow and stimulate movement in the Hickman catheter. When the client raises their arms, it helps to change the position of blood vessels and allows better access to the catheter. Coughing creates a temporary increase in the intra-thoracic pressure which can also aid in blood draw.

This is similar to the way a clinician may use a blood pressure cuff to temporarily halt blood flow when drawing a blood sample from a patient's arm, as described in your information. Also, similar to how blood can be collected through capillary action, and how blood flow direction can be changed like during an intravenous infusion. These changes and movements facilitate easier blood draw from the Hickman catheter.

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