§ 864.5430 Coagulation system for the measurement of whole blood viscoelastic properties in perioperative patients.

(a) Identification. A coagulation system for the measurement of whole blood viscoelastic properties in perioperative patients is an in vitro diagnostic device used to evaluate blood coagulation, fibrinolysis, or both, in perioperative patients, as an aid in the assessment of coagulopathies when used in conjunction with clinical signs and symptoms and other clinical and laboratory findings.

(b) Classification. Class II (special controls). The special controls for this device are:

(1) Design verification and validation must include detailed documentation of, and results from, the following:

(i) A study assessing precision using protocols determined to be acceptable by FDA, to cover the measurement range for each reported parameter (test output). Testing must include native specimens with coagulation profiles representative of the intended use population. In order to cover the measuring range, testing may include a limited number of contrived specimens, not to exceed 10 to 20 percent, or as otherwise deemed appropriate by FDA. The contrived specimens must be prepared to resemble clinical specimens. This testing must evaluate repeatability and reproducibility and provide assessments of within-run, within-day, between-run, between-day, between-reagent lot, between-instrument, between-site, and between-operator precision, as applicable to the system;

(ii) Studies that demonstrate the performance of each parameter (test output) throughout the claimed measurement range, to include linearity studies or dose-response studies, as applicable to the parameter (test output);

(iii) Potential interferent study that includes evaluation of hemolyzed and lipemic samples as potential interferents; exogenous and endogenous interferents associated with each patient population intended for use with the device, and which might be expected to affect assay performance, must be evaluated; and potential interferents that are specific for, or related to, the technology or methodology of the device. Evaluation of all potential interferents must be performed using a protocol determined to be acceptable to the FDA (e.g., an FDA-recognized standard) and include both normal and abnormal specimens covering coagulation profiles representative of the intended use population;

(iv) A study that evaluates specimen stability under the intended conditions for specimen collection, handling, and storage, using samples that cover the coagulation profiles representative of the intended use population, and using protocols determined to be acceptable by FDA;

(v) A multisite clinical study, determined to be acceptable by FDA, demonstrating performance, relative to clinically relevant and clinically validated laboratory test(s) for each parameter (test output). Further, the study must meet all of the following criteria:

(A) The study must be performed in the intended use population and include representation from all patient populations for whom the device is intended to be used. Potential endogenous and exogenous interferents for each target patient population must be evaluated or known prior to the study;

(B) The study must be conducted at a minimum of three external sites representative of the intended use setting by the intended operators;

(C) Test samples must be collected at time intervals relevant to the device's use in the intended use population;

(D) Clinical specimens, which cover coagulation profiles representative of the intended use population, must be evaluated at each of the three clinical sites in the study;

(E) Analysis of the concordance of clinical interpretation of patient coagulation status made from individual test parameter (test output) results as compared to clinical interpretation of coagulation status from a clinically relevant laboratory test or tests (e.g., a comparative viscoelastic device or standard laboratory tests) must be conducted; and

(F) Expected (reference) values for each parameter (test output) must be demonstrated by testing a statistically appropriate number of samples from apparently healthy normal individuals;

(vi) For a device with a user interface that has information that needs to be interpreted by the user in correctly using the device to achieve the intended test results or a device that does not provide a final output that is a comprehensive interpretation of all parameter (test output) results, a study evaluating the ability of device users to correctly interpret results;

(vii) For any device indicated to guide blood product use, a clinical outcome study determined to be acceptable by FDA that specifically validates the device's indicated use in guiding blood product use; and

(viii) For any device indicated to guide use of medication, a clinical outcome study determined to be acceptable by FDA that specifically validates the device's indicated use in guiding use of medication.

(2) The labeling required under § 809.10(b) of this chapter must include the following:

(i) A summary of results from the study required by paragraph (b)(1)(i) of this section, including repeatability, reproducibility, and assessments of within-run, within-day, between-run, between-day, between-reagent lot, between-instrument, between-site, and between-operator precision, as applicable to the system.

(ii) The claimed measurement range of each parameter (test output), as supported by demonstrated performance of the parameter (test output) throughout the claimed measurement range, including studies required by paragraphs (b)(1)(i) through (iii) and (v) of this section, and, if applicable, paragraphs (b)(1)(vii) and (viii) of this section.

(iii) Identification of known interferents, including all endogenous, exogenous, technology-specific, and patient population-specific interferents, specific to each parameter (test output). The information must include the concentration(s) or level(s) at which interference was found to occur and the concentration range or levels at which interference was not found to occur.

(iv) Information regarding the multisite clinical study required by paragraph (b)(1)(v) of this section, including:

(A) Each patient population evaluated;

(B) Each intended use setting and the operators;

(C) A summary of the results, including the concordance analysis to clinically relevant laboratory test(s); and

(D) Demonstrated expected (reference) values for each parameter (test output).

(3) The labeling required under § 809.10 of this chapter must include the following:

(i) A limiting statement that the result(s) from the device is(are) not intended to be used as the sole basis for a patient diagnosis.

(ii) Unless appropriate clinical outcome studies are done in accordance with paragraph (b)(1)(vii) of this section that specifically validate an indication for the device's use in guiding blood product use, a limiting statement that the device has not been evaluated to guide blood product use.

(iii) Unless appropriate clinical outcome studies are done in accordance with paragraph (b)(1)(viii) of this section that specifically validate an indication for the device's use in guiding use of medication, a limiting statement that the device has not been evaluated to guide use of medication.

[90 FR 19630, May 9, 2025]