Formerly known as Diassess, the Emeryville, California-based startup will use the funding to finance regulatory clearances and early commercialization.
The Australian molecular diagnostics firm will use the funds to accelerate commercial expansion in North America and global markets.
Denka now owns 33.4 percent of PlexBio's shares. PlexBio will use the financing for operations and product development.
The financing will go toward ongoing commercialization of the firm's autoimmune tests and therapeutics promotion business.
Variantyx, a 2014 spinout from Tel Aviv University that is based in Framingham, Massachusetts, provides clinical genomic testing for screening and rare disease diagnostics.
BioMérieux has increased its stake in Chinese immunoassay developer Hybiome Biomedical Engineering from 54 percent to 67 percent.
The new funding brings the Series B total to £23.3 million for the British clinical decision support technology developer.
The company envisions creating a "vocometer … to provide disease screening and management solutions based on acoustic analysis of seconds of voice."
Clinical informatics startup Ovation looks to grow its business in laboratory information systems for precision molecular diagnostic labs.
The firm said it raised €55.5 million to fund the expansion of its Idylla test platform, its sales and marketing activities, and other general corporate purposes.