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What Is A Dilute Specimen?

July 18, 2016 by Ken Hutchinson 14 Comments

What is a Dilute Specimen?

It’s not uncommon for employers to receive reports of drug screen results with the term “dilute specimen” associated with either a negative or positive result. In my former position as a Clinic Manager our Medical Review Officer (MRO) office would receive several phone calls a week asking us to explain what a dilute specimen result meant and what actions the Designated Employer Representative (DER) was required to take in order to maintain compliance with DOT regulations. Federal drug testing regulations outline the roles and responsibilities of laboratories, MROs and employers for handling a dilute specimen. However, some of the terminology used in each of these functions may be a little confusing. Let’s see if we can simplify things.

Laboratory Responsibilities

Labs must determine the creatinine levels of every specimen being tested. What is creatinine? Creatinine is a byproduct of creatine phosphate caused by muscle contractions and is filtered out of the blood through the kidneys. Normal creatinine levels indicate the test sample is undiluted, whereas low amounts of creatinine in the urine indicate the specimen has either been adulterated or manipulated in some way.

Labs use creatinine levels as a trigger to conduct further validity testing. If the creatinine level is less than 20 mg/dL, then the labs will also determine the specific gravity (the ratio of urine to water), as well as pH levels. They will also test for the presence of oxidants (bleach or ammonia) in the urine. These procedures are part of the validity testing.

Let’s look at the creatinine and specific gravity levels and how they relate to the specimen result. Labs report specimens as “dilute” when the creatinine levels are equal to or greater than 2 mg/dL and less than 20 mg/dL, and the specific gravity levels are greater than 1.0010 but less than 1.0030 (the specific gravity level of water is 1.0000). I know this may be pretty technical, but that is the criteria for reporting “dilute” results.  Scientists have established that the urine of normally hydrated person will not have creatine and specific gravity levels in this range.

If drug testing results are reported as “positive dilute specimen” – that is, the specimen tests positive for drugs and is also dilute – the results are considered positive.  The fact that the specimen is dilute is irrelevant.  If results are reported as “negative dilute specimen” the results are considered negative. However, there may be additional requirements for negative dilute specimens. These requirements may fall upon the MRO and/or the DER.

MRO Responsibilities

Upon receiving a negative dilute specimen result, the MRO must consider creatinine and specific gravity levels, which ultimately determines actions taken.

If the creatinine level is equal to or greater than 2 mg/dL but less than 5 mg/dL and the specific gravity level is greater than 1.0010 but less than 1.0030, then the DOT mandates the MRO to instruct the DER to have the specimen immediately recollected under direct observation. In other words, the specimen is valid but DOT requires another collection due to the rarity of the labs findings (40.197 (b)1)).  In the MRO world, these results are labeled “Extreme Dilutes”.

If the MRO receives a negative dilute specimen result with creatinine levels equal to or greater than 5 mg/dL but less than 20 mg/dL, then the result is reported as a negative dilute and neither the MRO nor the DER are required to perform any other actions, unless outlined in the employer’s drug and alcohol testing policy.

DER Responsibilities

If the DER is instructed by the MRO to have a specimen immediately recollected under direct observation, then the DER must comply with the MRO’s instructions and federal guidelines. For negative dilute results that do not require an immediate recollection, the MRO may note “Negative dilute, defer to company policy” on the results. Some companies conduct a recollection based on any result reported as a negative dilute specimen. The process of handling all dilute specimens should be outlined in the employer’s drug and alcohol testing policy.

I have talked to DERs that consider any dilute specimen result as a positive result or an attempt by the applicant to “beat the test”. I don’t agree. I realize there are people who try to beat drug tests. But not everyone is out to beat the system. Subjects who have previously tested understand they need to be able to provide a specimen when directed and will therefore drink plenty of fluids in advance. On the other hand, there are individuals who will try to “flush” their system with water in order to provide a “clean” specimen. Finally, there are those individuals that produce low creatinine levels naturally.

Regardless of how labs test or MRO’s report results or the causes of a dilute specimen, a company must be knowledgeable of these situations and have a plan of response.  It is a best practice for companies to have recollection procedures for negative dilute specimens outlined in their drug and alcohol testing policy. Take note: These recollections may not be conducted under direct observation. Only extreme dilute specimens require recollection under direct observation. If it’s not a DOT test, companies may consider recollections using alternative testing methods for negative dilute results, such as hair or saliva testing.

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Comments

  1. Ashley Maxwell says

    October 10, 2017 at 7:55 pm

    Thanks for your comment about how employees should be drug tested to know if they have negative dilute results. I like how you said that every company is able to have their own policy regarding these types of results. If someone with a business was considering EPA performed testing in the workplace, I would assume that they would keep this post in mind.

    Reply
  2. Ruth says

    June 25, 2018 at 3:01 pm

    If creatinine is low (15) but specific gravity is okay should you re-test the person?

    Reply
    • Jack Singleton says

      June 26, 2018 at 2:36 pm

      There are two parts of our answer to your question. The guidance we refer to is the Federal Regulations for workplace testing; you are not bound by these regulations if you are not performing workplace testing required by the Federal Dept. of Transportation (DOT). First of all, DOT regulations state that for a specimen to be considered dilute the creatinine must be greater or equal to 2 mg/dL but less than 20 mg/dL, and the specific gravity must be greater than 1.0010 but less than 1.0030. You state that the specific gravity is “ok.” Therefore, under DOT regulations the specimen does not meet the requirements to be a dilute specimen, since only the creatinine level is out of range.

      Because the specimen in your question is not dilute (and we assume is also negative) there is no need for a second collection.

      A second collection is required when a specimen is negative and is also “extreme” dilute, meaning the creatinine is greater than equal 2 mg/dL but less than or equal to 5 mg/dL. Employers may, but are not required to, perform a second collection for dilute specimens with creatinine levels above this range. If an employer chooses to collect a second specimen they must do it for every employee with a dilute negative specimen.

      Reply
  3. Ken says

    June 26, 2018 at 10:47 am

    Ruth,

    DOT is very specific when recollecting a specimen due to abnormal creatinine and specific gravity levels. If you are conducting Non-DOT collections, then you should follow the requirements outlined in your drug and alcohol testing policy. You must be consistent in your procedures. If you recollect for one person, then you will need to recollect for everyone with abnormally low levels that are determined by your drug and alcohol policy.

    Reply
  4. seren says

    September 7, 2018 at 4:02 am

    My doctor told me my urine samples have been invalid last 3 times, meaning levels point to diluted urine. He said unless I’m watering down my sample I should get my kidneys checked because there’s something wrong. One of my levels he said was an 8 and that was not normal, but I don’t remember what was 8. If it was the creatinine or ph levels I don’t know but I am very worried now. I looked some things up and I do have swelling and itching and fatigue. I don’t have nocturia but I have diluted urine in the middle of the day. What things could possibly be wrong with me to cause this because for sure 100% I did not water down my urine so I know it has to be something else.

    Reply
    • Jennie Lee-Pace says

      September 12, 2018 at 11:36 am

      Seren,
      We are not medical professionals and cannot provide a diagnosis. We encourage you to see your doctor.

      Reply
  5. Krissy says

    September 20, 2018 at 6:07 pm

    Can a diluted urine be tested at the lab or how does it come back?

    Reply
    • Jennie Lee-Pace says

      September 27, 2018 at 2:47 pm

      The urine is tested at a lab and the lab reports dilute based on creatinine and specific gravity levels. Does this answer your question?

      Reply
  6. Donna Booth says

    September 24, 2018 at 9:32 am

    Would like to know if the collection site (MRO office) has to explain in writing to the company what a dilute is…..even if the urine is negative????

    Reply
    • Jennie Lee-Pace says

      September 27, 2018 at 2:55 pm

      There is no known requirement that an MRO must submit in writing an explaination of what a dilute specimen is. They must report to the employer that the specimen was dilute, and in the case of a super or extremely dilute specimen if an immediate collection under direct observation is required. Otherwise dilute specimen results should be addressed per the employer’s drug policies.

      Reply
  7. Billy says

    June 12, 2019 at 4:29 pm

    Does sg and creatinine mirror each other? Would you expect if sg was near 1.003-1.005, for the creatine to be low as well? Can one supplement creatinine while overhydrating?

    Reply
    • Jennie Lee-Pace says

      June 14, 2019 at 8:53 am

      Hi Billy.

      This article may help answer some of your questions. https://www.redwoodtoxicology.com/resources/collection/specimen_verification

      Reply
  8. Jeremy says

    January 1, 2020 at 5:01 pm

    I had a ‘negative – dilute’ result, and re-took the urine screen. MRO advised re-taking it in the morning. Just got back the result, and it’s “value out of range” (too concentrated). Looking back, my creatine levels have consistently (for the last 3 years of 1-2x monthly testing) been very high, but only once before did I get a “VOR” result. I’m 6′, 250″ white male. Should I contact my normal doctor to see if I have problems with my kidneys, or is it possible that I just naturally have high levels of creatinine due to my size/weight?

    Reply
    • Jennie Lee-Pace says

      January 3, 2020 at 10:39 am

      Hi Jeremy.

      These are questions that are best posed to your doctor.

      Regards,

      Jennie

      Reply

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