Semi-Automatic Coagulation Analyzer with Turbidimetric Detection

What is the Semi-Automatic Coagulation Analyzer with Turbidimetric Detection?

This analyzer measures the increase in turbidity as fibrinogen is converted to fibrin, using a photometric channel that is well suited to fibrinogen assays and to reagents with a strong optical signal. It suits laboratories that need fibrinogen and clotting times from one instrument.

Overview

Turbidimetric detection uses a photometer, typically at 540 or 660 nanometers, to follow the increasing absorbance as fibrin strands scatter light. The instrument can therefore report both clotting times and, with the appropriate calibration, fibrinogen concentration, and it also supports turbidimetric immunoassays for D-dimer when the reagents and software are provided. Reaction curves are displayed so that the operator can see whether the signal was strong enough for reliable detection, which is useful when results are questioned. Sensitivity thresholds and reaction monitoring windows are programmable per assay. Because it shares the optical principle of many larger analyzers, results transfer readily between platforms, but coloured or turbid samples still need to be flagged and interpreted with care.

How does it work?

A semi-automatic coagulation analyzer provides a temperature-controlled measuring position, usually at 37 degrees Celsius, a detection system and a timer. The operator pipettes plasma into the cuvette, incubates it, adds the reagent and starts the measurement. Optical instruments detect the increase in turbidity or the change in light scatter as fibrin strands form; mechanical instruments detect the change in movement or viscosity of a steel ball or magnetic particle; turbidimetric and chromogenic instruments measure light absorption changes from the fibrin network or from a coloured product released by a synthetic substrate. The analyzer stops the timer at the detection threshold and reports the clotting time in seconds, a ratio for prothrombin time or a concentration for fibrinogen. Because sample and reagent handling remain manual, pipetting accuracy and consistent incubation timing have a large influence on results.

What are the key features?

• Photometric monitoring at 540 or 660 nanometers
• Fibrinogen measurement with appropriate calibration
• Turbidimetric immunoassay support for D-dimer in some models
• Reaction curve display for result verification
• Programmable detection thresholds per assay
• Consistency with optical results from larger analyzers

What are the technical specifications?

A typical semi-automatic coagulation analyzer with turbidimetric detection configuration offers detection principle of Turbidimetric photometry at 540 nm or 660 nm, channels of 2 or 4 measuring channels, incubation temperature of 37 °C ±0.3 °C, fibrinogen range of 0.5–8.0 g/L with dilution, measuring range of PT 5–100 s; APTT 15–150 s and curve display of Real-time reaction curve on screen. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Semi-Automatic Coagulation Analyzer with Turbidimetric Detection is used in fibrinogen measurement alongside PT and APTT, D-dimer testing in small laboratories, coagulation monitoring in anticoagulation clinics and veterinary hemostasis testing. Across the wider Semi-Automatic Coagulation Analyzers class, laboratories also deploy it for routine PT and APTT testing in clinics, anticoagulation monitoring with INR and pre-operative coagulation screening.

Which standards and certifications apply?

Relevant standards and methods include ISO 15189, CLSI H57, CLSI H21, CLSI EP05, ICSH recommendations on coagulation testing, IEC 61010-1 and IEC 61010-2-101. Certification candidates for this model are CE, ISO 13485 manufacturing and NMPA class II registration; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Place the analyzer on a level bench away from vibration and draughts, since both disturb optical clot detection, and allow the instrument to reach and hold 37 degrees Celsius before use. Verify performance at installation against a reference instrument or assigned plasma samples for prothrombin time, APTT and fibrinogen, and check the incubation temperature with an external thermometer. Daily work includes running normal and abnormal control plasma, checking reagent and cuvette lot numbers and recording all values. Reagents must be reconstituted, stored and expired strictly according to the instructions, and citrated plasma should be separated, frozen and thawed under controlled conditions because pre-analytical handling has a large influence on clotting times.

How do I select the right Semi-Automatic Coagulation Analyzer with Turbidimetric Detection?

Specify this variant when fibrinogen or turbidimetric immunoassays are part of your menu, or when you want to review the reaction curve for questionable results. In the RFQ confirm the wavelengths used, whether latex-enhanced D-dimer reagents are supported with validated parameters, and how the calibration and control material for those assays are supplied.

How does it compare with other Semi-Automatic Coagulation Analyzers variants?

Choose the detection principle according to the samples you receive: mechanical or magnetic detection tolerates icteric, hemolyzed and lipemic plasma, while optical detection is simpler and usually requires a clear sample. Then decide how many channels you need, because a four-channel instrument allows several patients or duplicate measurements in one run and reduces operator waiting time. Check the menu the instrument supports, especially whether fibrinogen, D-dimer or antithrombin assays are available, since not every semi-automatic platform can perform chromogenic or immunoturbidimetric tests. Confirm the sample and reagent volumes, the incubation temperature accuracy and the calibration requirements, and ask whether the analyzer stores calibrator values for each reagent lot.