a nurse is reviewing the medical record of a female client who has heart failure. the nurse should identify which of the following laboratory results as an indication that the client has fluid volume excess?

- urine specific gravity 1.05 (1.005 to 1.03)
- hematocrit 49% (37% to 47%)
- urine ph 4.4 (4.6 to 8)
- bun 8 mg/dl (10 to 20 mg/dl)

Question

a nurse is reviewing the medical record of a female client who has heart failure. the nurse should identify which of the following laboratory results as an indication that the client has fluid volume excess?

- urine specific gravity 1.05 (1.005 to 1.03)
- hematocrit 49% (37% to 47%)
- urine ph 4.4 (4.6 to 8)
- bun 8 mg/dl (10 to 20 mg/dl)

Accepted Answer

# Brief Explanations:
To determine the laboratory result indicating fluid volume excess in a heart failure client, we analyze each option:
1. **Urine specific gravity 1.05 (1.005 to 1.03)**: A high urine specific gravity (above the normal range) usually indicates concentrated urine, often seen in fluid volume deficit (dehydration), not excess.
2. **Hematocrit 49% (37% to 47%)**: Hematocrit is the percentage of red blood cells in the blood. In fluid volume excess, the blood is diluted, so hematocrit should be lower (hemodilution). A high hematocrit (49% > 47%) suggests fluid volume deficit (hemoconcentration), not excess. Wait, no—wait, maybe I got that wrong. Wait, in fluid volume excess, the plasma volume is increased, so the concentration of red blood cells (hematocrit) would be decreased (because the same number of RBCs are in a larger plasma volume). So a hematocrit of 49% is above normal, which would be consistent with fluid volume deficit (less plasma, so higher RBC concentration). So this is not fluid excess.
3. **Urine pH 4.4 (4.6 to 8)**: Urine pH outside the normal range (acidic here) is related to acid - base balance or other factors, not directly to fluid volume excess.
4. **BUN 8 mg/dL (10 to 20 mg/dL)**: Blood urea nitrogen (BUN) is a measure of urea in the blood. In fluid volume excess, the blood is diluted, so BUN levels are often decreased (because urea is more diluted in the increased plasma volume). A BUN of 8 mg/dL is below the normal range (10 - 20 mg/dL), which is consistent with fluid volume excess (hemodilution, so lower concentration of BUN). Wait, but let's re - evaluate the hematocrit. Wait, maybe I made a mistake with hematocrit. Wait, the question is about fluid volume excess. Let's re - analyze each:

Wait, let's correct the hematocrit analysis. In fluid volume excess (hypervolemia), the total blood volume is increased, mainly due to increased plasma volume. So the hematocrit (RBC percentage) will be decreased (because RBC count is relatively constant, and plasma volume is increased). So a hematocrit of 49% is above normal (37 - 47%), which is hemoconcentration (fluid volume deficit, hypovolemia). So that's not fluid excess.

Urine specific gravity: In fluid volume excess, the kidneys are trying to excrete the excess fluid, so urine should be more dilute (lower specific gravity). A specific gravity of 1.05 is higher than normal (1.005 - 1.03), which is concentrated urine, consistent with fluid deficit (the body is holding onto fluid, so urine is concentrated).

Urine pH: As mentioned, not related to fluid volume.

BUN: In fluid volume excess, the blood is diluted, so BUN (which is a solute in the blood) will be lower. The normal BUN is 10 - 20 mg/dL, and 8 mg/dL is low, consistent with fluid volume excess (hemodilution). Wait, but let's check the options again. Wait, maybe the correct answer is BUN? No, wait, maybe I messed up. Wait, the question is which is an indication of fluid volume excess. Let's recall:

In fluid volume excess (hypervolemia):

- Hematocrit: Decreased (hemodilution)
- BUN: Decreased (hemodilution)
- Urine specific gravity: Decreased (dilute urine, because the body is excreting excess fluid)
- Urine output: Increased (excreting excess fluid)

Wait, but the options:

- Urine specific gravity 1.05 (normal 1.005 - 1.03): High, so fluid deficit.
- Hematocrit 49% (normal 37 - 47%): High, fluid deficit.
- Urine pH 4.4 (normal 4.6 - 8): Low, not fluid related.
- BUN 8 mg/dL (normal 10 - 20): Low, which is consistent with fluid excess (hemodilution).

Wait, but maybe I made a mistake with hematocrit. Wait, no—if the client has fluid volume excess, the plasma volume is increased, so the hematocrit (RBC/ total blood volume) should be lower. So 49% is higher than normal, so that's fluid deficit. BUN is lower than normal, which is fluid excess. But let's check the options again. Wait, maybe the correct answer is BUN? Wait, but let's confirm with the concepts.

Fluid volume excess (hypervolemia) leads to hemodilution, which causes:

- Decreased hematocrit (RBC concentration)
- Decreased BUN (urea concentration)
- Decreased urine specific gravity (dilute urine)

So among the options:

- Urine specific gravity 1.05: High (concentrated) → fluid deficit.
- Hematocrit 49%: High → fluid deficit.
- Urine pH 4.4: Abnormal, but not fluid related.
- BUN 8 mg/dL: Low → fluid excess (hemodilution).

Wait, but maybe the question has a trick. Wait, no—let's check the normal ranges again.

Urine specific gravity normal: 1.005 - 1.03. So 1.05 is high (concentrated urine) → fluid deficit (body is retaining fluid, so urine is concentrated).

Hematocrit normal for females: 37 - 47%. 49% is high → fluid deficit (hemoconcentration, less plasma, so higher RBC concentration).

Urine pH normal: 4.6 - 8. 4.4 is low (acidic) → not fluid related.

BUN normal: 10 - 20 mg/dL. 8 is low → fluid excess (hemodilution, more plasma, so BUN is diluted).

So the correct answer is the BUN option? Wait, no—wait, maybe I got the BUN wrong. Wait, BUN is urea nitrogen in the blood. In fluid volume excess, the blood is diluted, so BUN is lower. So 8 mg/dL is lower than normal (10 - 20), so that's fluid excess. But let's check the other options again.

Wait, the first option: Urine specific gravity 1.05 (normal 1.005 - 1.03). High specific gravity means concentrated urine, which is seen in fluid deficit (the body is holding onto water, so urine is concentrated). So that's fluid deficit.

Hematocrit 49%: High, fluid deficit (hemoconcentration).

Urine pH 4.4: Acidic urine, not fluid related.

BUN 8 mg/dL: Low, fluid excess (hemodilution).

So the answer should be the BUN option? Wait, but let's confirm with nursing knowledge. In heart failure, fluid volume excess is common. Signs of fluid volume excess include hemodilution (decreased hematocrit, decreased BUN, decreased urine specific gravity). Wait, but the urine specific gravity here is high, which is opposite. Hematocrit is high, opposite. BUN is low, which is correct. Urine pH is low, not related. So the correct answer is BUN 8 mg/dL? Wait, no—wait, maybe I made a mistake. Wait, the normal BUN is 10 - 20, so 8 is low. So yes, that's fluid excess. But let's check the options again. Wait, the options are:

1. Urine specific gravity 1.05 (1.005 to 1.03)
2. Hematocrit 49% (37% to 47%)
3. Urine pH 4.4 (4.6 to 8)
4. BUN 8 mg/dL (10 to 20 mg/dL)

Wait, maybe the correct answer is the BUN option. But let's think again. In fluid volume excess, the kidneys are excreting more fluid, so urine output is increased, urine specific gravity is low (dilute), BUN is low (diluted), hematocrit is low (diluted). So among the options, the only one that is consistent with fluid excess (hemodilution - related) is BUN 8 mg/dL (low, due to dilution) and maybe hematocrit? No, hematocrit is high. Wait, I'm confused. Wait, maybe the question has a typo, or I'm misremembering. Wait, let's check each parameter:

- Urine specific gravity: Normal range 1.005 - 1.03. 1.05 is high. In fluid volume excess, urine specific gravity should be low (because the body is excreting excess fluid, so urine is dilute). So high specific gravity is fluid deficit.

- Hematocrit: Normal 37 - 47% (female). 49% is high. In fluid volume excess, hematocrit is low (hemodilution). So high hematocrit is fluid deficit.

- Urine pH: Normal 4.6 - 8. 4.4 is low (acidic). Not related to fluid volume.

- BUN: Normal 10 - 20 mg/dL. 8 is low. In fluid volume excess, BUN is low (hemodilution). So this is consistent with fluid volume excess.

So the correct answer is the BUN option? Wait, but let's confirm with a reference. In fluid volume excess, the blood is diluted, so BUN and hematocrit are decreased. So BUN 8 mg/dL (decreased) is consistent with fluid excess. The other options: urine specific gravity increased (fluid deficit), hematocrit increased (fluid deficit), urine pH decreased (not fluid related). So the answer is BUN 8 mg/dL. Wait, but the option is "BUN 8 mg/dL (10 to 20 mg/dL)". So that's the correct one.
# Answer:
BUN 8 mg/dL (10 to 20 mg/dL)

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