Posts Tagged ‘RDW’

It’s not pernicious if the patient live

February 28, 2017

To test, I wouldn’t think twice

The abnormal I find ever so nice

And if that’s what they’ve got

I just treat with a shot

Still cheap at thirty times the price.

Synopsis: I’m a Family Practitioner from Sioux City, Iowa. In 2010 I danced back from the brink of burnout, and honoring a 1 year non-compete clause, traveled and worked in out-of-the-way places in Alaska, Nebraska, Iowa, and New Zealand. After three years working with a Community Health Center, I went back to adventures in temporary positions until they have an Electronic Medical Record (EMR) system I can get along with. Assignments in Nome, Alaska, rural Iowa, and suburban Pennsylvania stretched into fall 2015. Since last winter I’ve worked in Alaska and western Nebraska, and taken time to deal with my wife’s (benign) brain tumor. After a moose hunt in Canada, and short jobs in western Iowa and Alaska, I am working in Clarinda, Iowa. Any identifiable patient information has been included with permission.

 

About twenty years ago I stopped a neurologist in the hospital parking lot for a “curbside consult,” a long-standing tradition. These brief interactions transmit a lot of information.  In the days before the Internet, I realized I needed to know more about vitamin B12 deficiency than I could get from books or journals.

In medical school they taught us not to check B12 levels on anyone under 40. The characteristic findings on the blood smear, they said, with enlarged red cells, anemia, and white cells with too many nuclei, would show before anything neurologic; thus we shouldn’t run the expensive test if the person had a normal blood count.

Time has a way of slaughtering such dogma. I found myself in the middle of a diagnostic series of B12 deficiencies, the most recent at that time a 36-year-old with the classic blood findings. I modified my age criteria and, sure enough, found a very low B12 level, helping to account for symptoms of what otherwise looked like depression with clumsiness.

Before I collared the neurologist, I’d sat down to talk with the hematologist. In the course of 5 minutes I realized he didn’t know much more about the topic than I did.  Approaching the neurologist turned out well.

He said that anything under the lower limit of normal (has gone back and forth between 199 and 287 and has now held steady at 211) clearly shows a problem. Any B12 level over 400 can’t take the blame for a problem.  But the gray zone between 211 and 400 demands judgment.  Anyone with symptoms at or past age 65, he told me, should be treated.  At 35 cents a dose, you can’t justify the expense of further testing.

Since I started this blog in 2010, the price of vitamin B12 has gone from $.35 to $9.00 per dose, justifying further testing in the borderline area. Now when I have suspicions, I check levels of methylmalonic acid and homocysteine, two toxic byproducts that build up in the blood in the absence of adequate vitamin B12 and/or folic acid.

Just about anything neurologic, whether subjective or objective, prompts me to investigate. If someone complains of fatigue, numbness, weakness, depression, erectile dysfunction or trouble concentrating, I go looking.  And the same if the blood smear shows enlarged red cells (an increased MCV or mean corpuscular volume), or even a broadened range of red cell sizes (RDW, or red cell distribution width).

Last week I found 4 new cases of vitamin B12 deficiency on one morning, making me ecstatic to the point of silly. The next day I got elevated homocysteine levels  back on two other patients with borderline B12 levels.

We used to call vitamin B12 deficiency pernicious anemia because the patient always died, and I grew to love the diagnosis because as a frontline doctor I could save the patient’s life for 2 cents a day. Now it costs 30 cents a day.  It still makes me happy.

 

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