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a lack or shortage; a condition characterized by the presence of less than the normal or necessary supply or competence.
color vision deficiency see color vision deficiency.
deficiency disease a condition due to dietary or metabolic deficiency, including all diseases caused by an insufficient supply of essential nutrients.
iron deficiency deficiency of iron in the system, as from blood loss, low dietary iron, or a disease condition that inhibits iron uptake. See iron and iron deficiency anemia.


An insufficient quantity of some substance (as in dietary deficiency or hemoglobin deficiency in marrow aplasia), organization (as in mental deficiency), activity (as in enzyme deficiency or reduced oxygen-carrying capacity of the blood), etc., of which the amount present is of normal quality.
See also: deficiency disease.
[L. deficio, to fail, fr. facio, to do]


Genetics Loss of a segment of a chromosome. See Chromosome Lab medicine An inadequacy in procedure, record-keeping, policy, or implementation thereof, that has been identified by a regulatory agency Medtalk Any absolute or relative lack of an exogenous or endogenous substance in the body. See Aldolase A deficiency, Alpha2-antiplasmin deficiency, Alpha-1 antitrypsin deficiency, Androgen deficiency, Apolipoprotein C-II deficiency, Apolipoprotein E deficiency, Arginase deficiency, Arginine deficiency, Biotin deficiency, Calcium deficiency, Carnitine deficiency, Carnosinase deficiency, Chromium deficiency, Condition level deficiency, Congenital antithrombin III deficiency, δ-sarcoglycan deficiency, Diphosphoglycerate mutase deficiency, Eosinophil peroxidase deficiency, Factor V deficiency, Factor VII deficiency, Factor X deficiency, Glucocerebrosidase deficiency, Glucose-6-phosphate dehydrogenase deficiency, Gonadotropin deficiency, Hageman factor deficiency, HDPRT deficiency, Hexokinase deficiency, Hexose phosphate isomerase deficiency, HMG-CoA synthase deficiency, Immunodeficiency, Immunoglobulin A deficiency, Immunoglobulin M deficiency, Iodine deficiency, Iron deficiency, Lactase deficiency, L-CHAD deficiency, Late-onset immune deficiency, LFA-1 deficiency, Lipoprotein lipase deficiency, Lysyl-protocollagen hydroxylase deficiency, Magnesium deficiency, Manganese deficiency, Medium chain acyl-coenzyme A dehydrogenase deficiency, Methemoglobin reductase deficiency. 5,10-methylenetetrahydrofolate reductase–MTHFR deficiency, MHC class II deficiency, Myeloperoxidase deficiency, Neuraminidase deficiency with beta-galactosidase deficiency, Ornithine transcarbamylase deficiency, Plasminogen activator inhibitor-1 deficiency, Protein deficiency, Protein C deficiency, Protein S deficiency, Purine nucleoside phosphorylase deficiency, Secondary deficiency, Selenium deficiency, Severe combined immune deficiency, Sucrase-isomaltase deficiency, Testosterone 17 β-dehydrogenase (NADP+) deficiency, Triosephosphate isomerase deficiency, Vitamin A deficiency, Vitamin C deficiency, Vitamin D deficiency, Vitamin E deficiency, Vitamin K deficiency, Zinc deficiency.


An insufficient quantity of some substance (as in dietary deficiency, hemoglobin deficiency (as in marrow aplasia), organization (as in mental deficiency), activity (as in enzyme deficiency or reduced oxygen-carrying capacity of the blood), or other process or component of which the amount present is of decreased quantity.
See also: deficiency disease
[L. deficio, to fail, fr. facio, to do]


a shortage of some quality or element necessary for health.


A shortage of something necessary for health.
Mentioned in: Kinesiology, Applied


An insufficient quantity of some substance, or organizational activity of which the amount present is of normal quality.
[L. deficio, to fail, fr. facio, to do]

Patient discussion about deficiency

Q. haemoglobin deficiency Haemoglobin deficiency - 6.3 rbc count less than normal range. platelets are 157000

A. what you describe here is pretty harsh numbers. very very low hemoglobin, low platelets level...have you checked for white blood cells? i recommend seeing a Dr. ASAP. with these numbers there is a good chance that you'll bleed from places that are not supposed to bleed.

Q. Recently I came to know after a test that I am vitamin D deficient so how much vitamin D should I take? I am 26 yrs old and I have fibromyalgia. Recently I came to know after a test that I am vitamin D deficient so how much vitamin D should I take?

A. what is a normal level of vitamin d for a 65 yr old woman?

Q. what can be done for spontaneous hypothermia? is there a deficiency of hormones or anything that can be taken

A. hypothermia can be caused by al sort of things. Some bacterial infections, poisoning, aciduria , hypothyroidism and more. Is this the only symptom? I’m sure there are some others. But I think this could be a good idea to check up with a Dr.

More discussions about deficiency
References in periodicals archive ?
As inherited combined factor deficiencies are quite rare, it probably represents the acquired deficiencies secondary to vitamin K deficiency especially in the newborns or liver disease mainly in the adults.
A deficiency, or a combination of deficiencies, in internal control that is less severe than a material weakness yet important enough to merit attention by those charged with governance.
Findings may not be applicable to women with other deficiencies
Another aspect of this topic is "refund interest," which is commonly referred to as "allowable interest." Section 6611(b)(1) provides that allowable interest on an overpayment that is offset to pay an amount due in another tax account will be paid "from the date of the overpayment to the due date of the amount against which the credit is taken." The issue that gives rise to a helpful payment strategy is the current definition of the "due date of a deficiency" as determined by the IRS, which sets the ending date of allowable interest on overpayment amounts that are offset to pay deficiencies.
* Sales revenue, accounts receivable, inventory, and accounts payable experienced the most control deficiencies. Less than 4% were in the IT area.
It has been estimated that 99 percent of all deficiencies have roots in miscommunication.
"We were upfront with any issues and deficiencies that we uncovered, and explained exactly how they would be remediated." The Implementation Team also developed special educational programs for the top 200 leaders at Dow, and has had multiple meetings with the Office of the Chief Executive.
A second potential difference between inadequacies and deficiencies is one of clarity.
Let's examine some claims based upon assessment deficiencies that were introduced in a recent civil case:
The proposed legislative changes deal with ISO/AMT deficiencies. However, many taxpayers with significant exercises of nonqualifled stock options have deficiencies as well.
These high levels can be detected by a blood test, and are often caused by dietary deficiencies that can be corrected.
It ensures uniformity in the data collection process and standardization of the deficiencies and the language used, regardless of the number of people involved in the assessment process or the number of sites being surveyed.