A nurse is assisting with the admission of a client who has hyperemesis gravidarum. Which of the following laboratory tests is the priority to complete?

(a) Serum bilirubin:
While serum bilirubin can provide useful information about liver function, it is not the most immediate concern for a client with hyperemesis gravidarum. This condition primarily involves severe nausea and vomiting, which can lead to dehydration and ketosis.

(b) Liver enzymes:
Liver enzymes can be elevated in hyperemesis gravidarum, but they are not the primary concern. The immediate priority is to assess the extent of dehydration and metabolic disturbances.

(c) Urinalysis for ketones:
This test is the priority because it helps determine the extent of dehydration and ketosis. In hyperemesis gravidarum, severe vomiting can lead to significant fluid and electrolyte imbalances and ketosis, which need to be identified and corrected promptly to prevent further complications.

(d) CBC:
A complete blood count (CBC) provides useful information about overall health and can identify anemia or infection, but it is not the priority for immediate assessment of hyperemesis gravidarum. The immediate need is to evaluate hydration status and ketosis, which is best done through urinalysis for ketones.

(A) Assist the client to empty her bladder:
Emptying the bladder is an essential intervention, especially in laboring women with epidural anesthesia, as a full bladder can contribute to hypotension. However, in this scenario, the priority is to address the hypotension directly with fluid administration. After stabilizing the client's blood pressure, assisting with bladder emptying would be appropriate.

(B) Place the client in knee-chest position:
The knee-chest position is not typically indicated for managing hypotension. While this position can increase venous return to the heart and potentially increase blood pressure, it is not the initial intervention for hypotension associated with epidural anesthesia. Intravenous fluid administration is the primary intervention to increase blood pressure in this situation.

(C) Administer methylergonovine IM:
Methylergonovine is a medication used to prevent or treat postpartum hemorrhage by causing uterine contractions. It is not indicated for the management of hypotension associated with epidural anesthesia during labor. Administering methylergonovine in this situation could potentially exacerbate hypotension and should be avoided.

(D) Give a bolus of lactated Ringer's:
The client's blood pressure is low (80/40 mm Hg), indicating hypotension. Hypotension can be a common side effect of epidural anesthesia during labor. Administering a bolus of intravenous fluids, such as lactated Ringer's solution, is the initial intervention to address hypotension. Fluid administration helps increase intravascular volume, improving blood pressure and perfusion to vital organs.