16.1 Consent, ABN, Test Ordering, and PPM Restrictions
Key Takeaways
- Routine venipuncture usually proceeds on implied consent after identity check and a brief explanation; written consent is reserved for named high-risk, research, or SOP-specified tests, not every blood draw.
- An Advance Beneficiary Notice (ABN), Form CMS-R-131, is Medicare's waiver of financial liability issued before a test when Original Medicare is expected not to pay; it is not a consent form and not a diagnosis.
- CLIA 42 CFR § 493.1241 requires a written or electronic test request from an authorized person under state law; a CMLA does not invent add-on tests because they seem useful.
- Oral laboratory requests are allowed only if the laboratory solicits written or electronic authorization within 30 days and keeps that documentation (42 CFR § 493.1241(b)).
- CLIA restricts provider-performed microscopy (PPM) to physicians, midlevel practitioners, and dentists; CMLA staff do not perform PPM wet mounts, KOH preps, or urine sediments as PPM even if they can operate a microscope.
CMLA Work Area IV (Patient Test Management, Communications, and Foundations) is 36 items, or 18.0% of the 200-question exam. Competency 11 opens with principles of liability in the laboratory. AMT IV.11.A.1–3 and IV.11.A.6 ask you to know consent forms, the Medicare Advance Beneficiary Notice (ABN), regulations for ordering tests, and the rule that provider-performed microscopy (PPM) is restricted to providers only. These are four different legal tools. Mixing them is a classic miss: an ABN is not consent, a requisition is not a diagnosis, and a microscope on the bench is not a license for a CMLA to do PPM.
Quick Answer: Identify the patient, explain the stick, and proceed on implied consent if the patient extends an arm. Use a written consent only when SOP or law names that test. Issue Form CMS-R-131 (ABN) before a test when Original Medicare may not pay. Collect only what an authorized person ordered. Leave PPM to physicians, midlevel practitioners, and dentists.
Consent forms: informed, implied, written
Consent is a competent patient's agreement to a procedure after enough information to decide. Informed consent names the procedure, material risks, benefits, and alternatives, and includes the right to refuse. Express consent is spoken or written. Implied consent is shown by conduct. Written consent is a signed form stored in the record.
For routine venipuncture and most waived collections, implied consent is the everyday rule after you complete identification and a short explanation (what you are drawing, which arm, that they will feel a stick). Extending an arm, rolling up a sleeve, or seating at the chair after that explanation is agreement. You still stop for questions, flinching, or a spoken no. Implied consent is not a blank check to stick a sleeping, restrained, or arguing patient.
Written consent is for named high-risk or legally special work: surgery and other invasive procedures on the clinical side, research or experimental testing, and tests your standard operating procedure (SOP) or state law flags (some human immunodeficiency virus (HIV), genetic, or forensic collections). Chapter 8.3 already covered chain of custody; here the point is that a legal blood-alcohol or workplace drug-screen kit often rides on a specific consent or collection form in addition to the kit paperwork. Do not treat a general admission consent as permission to ignore a test-specific form.
Capacity means the patient can understand and decide. Minors usually need a parent or legal guardian except where state law recognizes emancipation or a listed exception. If the patient lacks capacity, a personal representative (health-care agent, guardian) consents. Language barriers need a qualified interpreter per facility policy; do not default to a family member as the sole interpreter when SOP forbids it. If the patient cannot hear you, cannot see the form, or is in acute distress, you do not treat a shrug as informed consent.
A consent form is not a waiver of the standard of care. Signing does not authorize a wrong patient, a femoral stick outside CMLA routine, or a second attempt after a clear refusal.
ABN: Medicare's waiver of financial liability
AMT IV.11.A.2 names the waiver of liability for Medicare (Advance Beneficiary Notice - ABN). The official form is CMS-R-131, issued by providers including independent laboratories, physicians, practitioners, and suppliers to Original Medicare (fee-for-service) beneficiaries when Medicare payment is expected to be denied. CMS's Beneficiary Notices Initiative describes the ABN as the notice used to transfer potential financial liability in those cases. Guidelines live in the Medicare Claims Processing Manual (Publication 100-04), Chapter 30, beginning at Section 50.
An ABN is not informed consent, not HIPAA authorization, and not a diagnosis. It answers a money question: Medicare may not pay for this item, test, or service in this situation. Typical laboratory triggers include medical necessity (the diagnosis does not support coverage), frequency limits (screening or monitoring tests ordered more often than Medicare allows), and tests expected to be denied as experimental, investigational, or not proven effective. Screening laboratory tests often have set frequency windows; repeating inside that window is a classic ABN event. Physicians should forward completed ABNs to the laboratory; the lab still must have the notice before performing the noncovered service when a mandatory ABN applies.
Issue the ABN before the test, in a form the beneficiary can read, with the test named, the reason Medicare may not pay, and an estimated cost field. CMLA does not invent dollar amounts as exam facts; complete the estimate from the facility chargemaster or billing SOP, not from memory. The beneficiary (or representative) must choose one option, then sign and date:
| Option | What the beneficiary chooses | What happens next |
|---|---|---|
| 1 | Wants the test and wants Medicare billed for an official payment decision | You may collect payment now; if Medicare denies, the patient is liable; appeal rights attach to the Medicare decision |
| 2 | Wants the test but do not bill Medicare | Patient accepts financial responsibility; no Medicare claim, so no Medicare appeal |
| 3 | Does not want the test | Do not collect or bill for that listed test |
Do not present an ABN after the draw and call it valid. Do not use an ABN as a blank to add tests the authorized person never ordered. Medicare Advantage and other payers use different notices; AMT names the Medicare ABN, not a homemade "we might not get paid" sticky note.
Regulations for ordering tests
42 CFR § 493.1241 (CLIA Standard: Test request) requires a written or electronic request from an authorized person. 42 CFR § 493.2 defines an authorized person as an individual authorized under State law to order tests or receive results, or both. That is a licensed provider acting inside state scope (physician, and in many states a nurse practitioner (NP), physician assistant (PA), dentist, or other listed practitioner)—not the assistant who likes extra chemistry.
You do not invent add-on tests. A complete blood count (CBC) order is not permission to add a basic metabolic panel because the patient looks dehydrated. A patient saying "while you are at it, check my thyroid" is a request to route to the authorized person, not a new order you write. Reflex testing that is built into a laboratory-approved protocol (for example a thyroid algorithm the medical director signed) is not freelance add-on work; it is part of the ordered test system. Direct-access testing, where it is legal, is still ordered through the laboratory's authorized pathway, not by the collector deciding the menu.
Oral requests: the laboratory may accept them if it solicits written or electronic authorization within 30 days and keeps the authorization or documentation of efforts to obtain it (§ 493.1241(b)). The requisition must solicit identity of the authorized person, patient identifiers, sex and age or date of birth, tests, specimen source when needed, collection date and time when appropriate, and any other information needed for accurate testing (§ 493.1241(c)). If you transcribe into the laboratory information system (LIS), the entry must be accurate (§ 493.1241(e)). Wrong test code is a liability event, not a keyboard shrug.
PPM is providers only
AMT IV.11.A.6: regulations restrict provider-performed microscopy (PPM) to providers only. Under the Clinical Laboratory Improvement Amendments of 1988 (CLIA), a Certificate for PPM procedures lets licensed physicians, midlevel practitioners (classically nurse midwife, NP, or PA), and dentists perform a limited list of moderate complexity microscopic tests during the patient visit, plus waived tests. CDC's PPM materials (updated into 2026) still frame those three provider groups as the people who perform PPM and who may direct a PPM laboratory.
PPM tests are not waived. They use bright-field or phase-contrast microscopy and do not qualify as simple waived procedures. Common CMS/CDC PPM examinations include wet mounts (vaginal, cervical, or skin), potassium hydroxide (KOH) preparations, pinworm examinations, fern tests, post-coital mucus examinations, urine sediment examinations, nasal smears for granulocytes, fecal leukocyte examinations, and qualitative semen analysis limited to presence or absence of sperm and motility. A CMLA may prepare, transport, or accession specimens and may perform waived microscopy that the facility's certificate and competency actually allow (Chapter 14). That is not a PPM certificate and not permission to read a provider-only wet mount as if you were the clinician.
If the order is a PPM examination, the provider performs it. You do not "help" by looking down the ocular and calling yeast because the clinic is busy. Doing so is practicing outside CMLA and CLIA scope.
In practice
An Original Medicare patient arrives with a CBC and a screening fecal occult blood test ordered more often than Medicare frequency rules allow. You identify the patient, explain the venipuncture, and obtain implied consent for the CBC. Billing staff (or you, if trained) present a CMS-R-131 for the fecal test before collection; the patient selects Option 3, so you do not collect that stool kit. You do not add a comprehensive metabolic panel. You do not perform a vaginal wet mount under the PPM list.
Exam traps
- Implied consent is not consent after a spoken refusal.
- ABN is liability notice, not consent and not HIPAA.
- Do not invent ABN dollar amounts as CMLA facts.
- Authorized person is state-law authority, not whoever is standing nearest the rack.
- PPM is physicians, midlevel practitioners, and dentists—not CMLA microscopy practice.
A Medicare fee-for-service patient needs a laboratory test that the laboratory expects Original Medicare will deny for medical necessity. Which statement describes the Advance Beneficiary Notice correctly?
A clinic microscope is free and a vaginal wet mount is ordered as provider-performed microscopy. Who may perform that PPM examination under CLIA?
A written requisition from an authorized nurse practitioner lists a CBC only. The patient looks dehydrated, and you think a basic metabolic panel would help. What does CLIA test-ordering regulation require?