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- Jul 12, 2004
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Had a young psych patient the other day who we medically cleared. All the labs were normal however, the K+ was 3.2.
Ha! We got a call from the crisis facility saying they won't take the patient unless the K+ goes up, so the patient spent another 3-4 hours in the ED drinking K+, next lab test was 3.9, and everything was fine.
Got me thinking about the necessity of ordering any labs at all, or only ones that are actually needed. I'm fully aware that we, as ED physicians, order too many tests on psych patients overall for medical clearance and it is often easier to just order them for the sake of dispo, rather than spending 20-30 minutes on the phone during your shift arguing with the pinhead on the other end of the line about why you don't need certain lab tests done.
So instead of the common screening tests BMP, CBC, LFT, UA, Tox screen, EtOh, and +/- UPreg, the question really becomes whether any abnormal values from the above can cause psychosis, depression, acute anxiety, SI, HI...
I'm thinking the following can cause goofy, non-specific behavior mimicking acute psych disease...
- Sodium Level
- Cr/BUN
- Glucose Level
- WBC
- EtOH
- I'm +/- on tox screen (I often don't care if you are doing drugs)
I think the following are likely useless:
- K+, Cl-, Ca+, Mg+, Phos+
- Hg/Hct
- Platelets
- the diff on a CBC, even if you end up getting a CBC, don't get the diff!!! I had someone rejected once because the "RDW" was abnormal.
- LFTs
I think the following are situational only...
- Ammonia, TSH, UA, HCO3-
So is this entire concept just ridiculous, or is there possibly some merit?
Ha! We got a call from the crisis facility saying they won't take the patient unless the K+ goes up, so the patient spent another 3-4 hours in the ED drinking K+, next lab test was 3.9, and everything was fine.
Got me thinking about the necessity of ordering any labs at all, or only ones that are actually needed. I'm fully aware that we, as ED physicians, order too many tests on psych patients overall for medical clearance and it is often easier to just order them for the sake of dispo, rather than spending 20-30 minutes on the phone during your shift arguing with the pinhead on the other end of the line about why you don't need certain lab tests done.
So instead of the common screening tests BMP, CBC, LFT, UA, Tox screen, EtOh, and +/- UPreg, the question really becomes whether any abnormal values from the above can cause psychosis, depression, acute anxiety, SI, HI...
I'm thinking the following can cause goofy, non-specific behavior mimicking acute psych disease...
- Sodium Level
- Cr/BUN
- Glucose Level
- WBC
- EtOH
- I'm +/- on tox screen (I often don't care if you are doing drugs)
I think the following are likely useless:
- K+, Cl-, Ca+, Mg+, Phos+
- Hg/Hct
- Platelets
- the diff on a CBC, even if you end up getting a CBC, don't get the diff!!! I had someone rejected once because the "RDW" was abnormal.
- LFTs
I think the following are situational only...
- Ammonia, TSH, UA, HCO3-
So is this entire concept just ridiculous, or is there possibly some merit?